1 /* $NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37
38 #include <dev/fdt/fdtvar.h>
39
40 #include <dev/ic/pl181reg.h>
41 #include <dev/ic/pl181var.h>
42
43 static int plmmc_fdt_match(device_t, cfdata_t, void *);
44 static void plmmc_fdt_attach(device_t, device_t, void *);
45
46 static const struct device_compatible_entry compat_data[] = {
47 { .compat = "arm,pl180" },
48 { .compat = "arm,pl181" },
49 DEVICE_COMPAT_EOL
50 };
51
52 CFATTACH_DECL_NEW(plmmc_fdt, sizeof(struct plmmc_softc),
53 plmmc_fdt_match, plmmc_fdt_attach, NULL, NULL);
54
55 static int
plmmc_fdt_match(device_t parent,cfdata_t cf,void * aux)56 plmmc_fdt_match(device_t parent, cfdata_t cf, void *aux)
57 {
58 struct fdt_attach_args * const faa = aux;
59
60 return of_compatible_match(faa->faa_phandle, compat_data);
61 }
62
63 static void
plmmc_fdt_attach(device_t parent,device_t self,void * aux)64 plmmc_fdt_attach(device_t parent, device_t self, void *aux)
65 {
66 struct plmmc_softc * const sc = device_private(self);
67 struct fdt_attach_args * const faa = aux;
68 const int phandle = faa->faa_phandle;
69 struct clk *clk;
70 bus_addr_t addr;
71 bus_size_t size;
72 void *ih;
73
74 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
75 aprint_error(": missing 'reg' property\n");
76 return;
77 }
78
79 clk = fdtbus_clock_get_index(phandle, 0);
80 if (clk == NULL) {
81 aprint_error(": couldn't get clock\n");
82 return;
83 }
84
85 if (clk_enable(clk) != 0) {
86 aprint_error(": couldn't enable clock\n");
87 return;
88 }
89
90 char intrstr[128];
91 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
92 aprint_error(": failed to decode interrupt\n");
93 return;
94 }
95
96 sc->sc_dev = self;
97 sc->sc_clock_freq = clk_get_rate(clk);
98 of_getprop_uint32(phandle, "max-frequency", &sc->sc_max_freq);
99 sc->sc_bst = faa->faa_bst;
100 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) {
101 aprint_error(": couldn't map device\n");
102 return;
103 }
104
105 aprint_naive("\n");
106 aprint_normal("\n");
107
108 ih = fdtbus_intr_establish_xname(phandle, 0, IPL_BIO, 0, plmmc_intr, sc,
109 device_xname(self));
110 if (ih == NULL) {
111 aprint_error_dev(self, "couldn't install interrupt handler\n");
112 return;
113 }
114 aprint_normal_dev(self, "interrupting on %s\n", intrstr);
115
116 plmmc_init(sc);
117 }
118